Expiring Half Day Timing Cover - Smiley Face - 1000pk

Perfect for school security, these adhesive timing covers change color when expired and are to be used with School Badges (sold separately). Simply place the cover over the School Badge, and the expiration process begins (approximately 4 hours). No need to worry about unauthorized re-use of uncollected badges. Secure, as the patented color change is highly visible from a distance. Adhesive round blue Smiley Face.